Ozone uptake by adult urban trees based on sap flow measurement
2012
Wang, Hua | Zhou, Weiqi | Wang, Xiaoke | Gao, Fuyuan | Zheng, Hua | Tong, Lei | Ouyang, Z. (Zhiyun)
The O₃ uptake in 17 adult trees of six urban species was evaluated by the sap flow-based approach under free atmospheric conditions. The results showed very large species differences in ground area scaled whole-tree ozone uptake ( [Formula: see text] ), with estimates ranging from 0.61 ± 0.07 nmol m⁻² s⁻¹ in Robinia pseudoacacia to 4.80 ± 1.04 nmol m⁻² s⁻¹ in Magnolia liliiflora. However, average [Formula: see text] by deciduous foliages was not significantly higher than that by evergreen ones (3.13 vs 2.21 nmol m⁻² s⁻¹, p = 0.160). Species of high canopy conductance for O₃ ( [Formula: see text] ) took up more O₃ than those of low [Formula: see text] , but that their sensitivity to vapour pressure deficit (D) were also higher, and their [Formula: see text] decreased faster with increasing D, regardless of species. The responses of [Formula: see text] to D and total radiation led to the relative high flux of O₃ uptake, indicating high ozone risk for urban tree species.
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